[Hallicrafters] S40 restoration

[Glen Zook]

The black "plastic" capacitors are still paper type
and definitely should be replaced.  I have seen many
radios that came from the factory with a "mix" of wax
and "plastic" capacitors.  The black capacitors are
known as "black beauties" and are a source of leakage
just like those of the wax type.

As for the electrolytics:  I have a number of
receivers that were built in the 1920s that still have
the original capacitors that show no hum at all.

Glen, K9STH


--- Brent Seres <bseres at hpedsb.on.ca> wrote:

I justa aquired an S40 which I am just beginning to
restore. On opening it up, I noticed that some of the
capacitors are of the usual wax and paper type. About
half are black, shiny plastic type(.02, .05 mfd) . 
They appear newer than the others. Is this a recap job
half done? Should I replace the black caps too?  The
radio seems to work well, no hum, so I assume that
after 60 years the filter cap must have been replaced.

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco


		
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